One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,14)(13,16)(17,18,22,25)(19,28,24,20)(21,26,30,32)(23,27,31,29)(9,11,12,16)(10,13,14,15)(17,19)(18,20)(21,23)(22,24)(25,28)(26,29)(27,32)(30,31)(2,5)(6,8)(10,14)(11,16)(17,20,23,26,22,28,31,32)(18,24,27,21,25,19,29,30)(10,14)(13,15)(18,25)(20,28)(26,32)(27,29) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,23,19,22,30,31,24)(18,26,27,28,25,32,29,20)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.